Installation data Shallow inspection chambers 250mm inspection chambers UCL2 or UCL3 lid and frame
Local concrete surround
UCC7 250mm inspection chamber
600mm max
250mm inspection chambers may be used as an alternative to traditional manholes for invert depths up to 600mm. Intermediate depths can be accommodated by cutting the chamber riser using a hard tipped handsaw or similar. The UCC7 is a one piece, level invert chamber with push-fit inlet and outlet sockets, making installation quick and easy. Square or circular PVCu lids and frames are available for use with 250mm diameter inspection chambers and meet the loading requirements of BS EN 124: 1994 Class A15. An alternative to the UCC7 is the level invert chamber base UAC44 with separate riser UAR1. Both square or circular lids and frames are suitable for use with this inspection chamber assembly. Where the UCC7 or UAC44 inspection chambers are used to make a 90° change of direction in the drain, 45° bends should be fitted to the inlet and outlet connections to maintain a level invert through the chamber. It is also recommended that the peak flow in the drain is always discharged through the main channel and chambers are rotated accordingly on site to accommodate this.
Bed and surround with suitable granular material
250mm bottom outlet inspection chambers UCL2 or UCL3 lid and frame
Local concrete surround
600mm max
UAR1 riser UAC02 chamber body UBL488 long radius bend
UE407 coupling
Alternative 45º bend & branch
14 | MARLEY Underground Drainage Systems
All documentation can be downloaded from marley.co.uk Technical hotline: 01622 852695
Bed and surround with suitable granular material
The 250mm bottom outlet inspection chamber UAC02 provides a multiple collection point for branch drains from one or more dwellings and may also serve as a rodding and testing point for the main drain. The 110mm bottom outlet ensures that discharges from the side branches are quickly transmitted to the main drain which may be situated directly under the chamber or to one side at a lower level. The bottom outlet chamber is ideal for situations where the main drain runs parallel to a building at a lower level as this allows the chamber to be positioned directly above the drain. Connection is then made using a back drop arrangement with a 45° branch and bend to the main drain. Each chamber has four 110mm spigot inlets, three of which are open and the fourth can be opened for use if necessary. The UE43 plug can be used to blank off connections not required and the chamber riser UAR1 cut to accommodate invert depths of less than 600mm. The UCL2 circular or UCL3 square lid and frame can be used to provide access to the chamber at ground level.
MARLEY Underground Drainage Systems | 15